public void GetFilter_HasOneFilter_ShouldReturnOneFilter()
{
var factory = new MessageFilterFactory(() => new[] { _firstFilter.Object });
var actual = factory.GetFilter();
Assert.AreEqual(_firstFilter.Object, actual);
_firstFilter.Verify(x => x.SetNextFilter(It.IsAny <IMessageFilter>()), Times.Never);
}
public void GetFilter_HasFilters_ShouldSetUpChainAndReturn()
{
var factory = new MessageFilterFactory(
() => new[] { _firstFilter.Object, _secondFilter.Object, _thirdFilter.Object });
var actual = factory.GetFilter();
Assert.AreEqual(_firstFilter.Object, actual);
_firstFilter.Verify(x => x.SetNextFilter(_secondFilter.Object), Times.Once);
_secondFilter.Verify(x => x.SetNextFilter(_thirdFilter.Object), Times.Once);
_thirdFilter.Verify(x => x.SetNextFilter(It.IsAny <IMessageFilter>()), Times.Never);
}
public void GetFilter_NoFilters_ShouldThrowException()
{
var factory = new MessageFilterFactory(() => Array.Empty <IChainedMessageFilter>());
Assert.Throws <ArgumentException>(() => factory.GetFilter());
}